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glaze test for tortoise shell, cone 6 ox.

updated wed 30 apr 03


Alisa Clausen on tue 29 apr 03

Glaze test for Tortoise Shell, cone 6 ox.

Glaze tested on white midrange stoneware fired in electric oxidation to =

Source: Clayart
Credited to:

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down 80c per hour to 800c
shut off kiln

3.91 Whiting
13.05 Dolomite
30.01 Flint
3.26 Lithium Carb.
22.18 EPK
27.59 Frit 3124

11.75 RIO
2.0 Bentonite

Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.

Frit 623 for 3124

A gloss iron brown glaze. Variations in a smooth surface of dark brown =
and lighter brown streaking best=20
visible on inside of test tile. A few red specks.

Regards from Alisa in Denmark